Replace LAFF with MIT's OCW Scholar Linear Algebra

Resolves #693

README.md

@@ -207,7 +207,7 @@ Courses | Duration | Effort | Prerequisites
 Courses | Duration | Effort | Prerequisites
 :-- | :--: | :--: | :--:
 [Essence of Linear Algebra](https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab) | - | - | [pre-calculus](https://www.futurelearn.com/courses/precalculus)
-[Linear Algebra - Foundations to Frontiers](https://www.edx.org/course/linear-algebra-foundations-to-frontiers-0) ([alt](http://ulaff.net/)) | 15 weeks | 8 hours/week | Essence of Linear Algebra
+[Linear Algebra](https://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/) | 14 weeks | 12 hours/week | Essence of Linear Algebra
 
 #### Logic
 Courses | Duration | Effort | Prerequisites